Patent GB-205436-A (GB)
Abstract: 205,436. Haddan, A. J. H., (National Cash Register Co.). June 9, 1922. Keyboard interlocks; printing totals and sub-totals.-Keyboard mechanism for machines having several banks of control keys and a total lever adjustable to several positions is provided with a flanged disc appropriate to each bank of keys and having notches in the flanges co-operating with the zero trip pawls and detents for normally permitting the.operation of a key in each bank and means controlled by the total lever for adjusting all discs whereby a key in one bank only may be operated. The machine has six banks of amount keys 71, banks 72, 73, 74 of transaction, departmental and clerk's keys, and a total-lever 75. The keys 71 co-operate with detent and locking plates 79, 80. The locking is effected when the shaft 57 rocks, arms 94 on the shaft carrying a rod 93 which moves the locking plates 80 upwards. The banks of control keys 72, 73, 74 are provided with similar detent and locking plates. The upper pivoted arms 110 carrying the detent plates for the control banks have pins 112 engaging a slotted arm 113 on a casting 114 loose on the shaft 115. An arm 116 on the casting 114 appertaining to the bank of keys 71 rests in front of an L-shaped lever 117 on a sleeve 118 slidable on but not rotatable relatively to the shaft 57. For the key banks 73, 74 there are arms 121, 123 lying in front of similar L-shaped levers 122, 124. Thus in the normal position of the total lever 75, it is necessary to depress a key in each control bank in order to allow the shaft 57 to rock. An arm 138, Fig. 2, on the right end of the shaft 57 carries a pin 139 projecting into a slot 140 in a link 141 a compression spring 1142 tending to move the pin upwards and to rock the shaft 57 clockwise. When this shaft rocks, an arm on the other end of the shaft is rocked and the motor is started or the hand-drive permitted. Towards the end of the operation of the machine, the arm 144 is rocked by cam-groove and roller mechanism 145, 146 to lower the link 141. This causes the shaft 57 to rock first counterclockwise past normal and then clockwise to normal. The rod 93 moves with detent and locking plates 79, 80 to release the keys 71, and the shaft 57 and the motor control gear are restored. An arm 151 on the shaft 57 and projections 152, 153 on the sleeve 118 release keys on the control banks by engagement with extensions 154 on the detent plates. If keys on the three banks are retained depressed by the fingers, arms 155 loose on shaft 115 are pulled upwards by springs 156 and the shoulders 157 lie in the path of the L-shaped levers 117 &c. preventing counterclockwise rotation of the shaft 57 and a consequent second release of the machine. The total lever 75 is moved upwards in its slot 161 from central or adding position for sub-totals, and downwards for grand totals. The bolts of locks 163 normally close the slot 161 above and below the central position of the lever. The total lever has a gear segment 164 which through gear 165 and a drum-cam 166 and collar 170 causes the sleeve 118 to be slid to the right or left. Each step of this sleeve movement moves the arms 117, 122, 124 out of contact with two of the three arms 116, 121, 123 so that only one pair will engage and thus only keys in the keybank selected by the total lever are capable of releasing the machine. The keys on the other two banks are locked by the following means. A segment 176 in gear with a segment 174 fast with the total lever has attached to it a bar 1771 which is also secured to three discs 178 provided with laterally extending notched flanges 179 which lie below the tails 181 of the zero trip pawls 103 of the key banks 72, 73, 74. In the central position of the lever 75, the notches in the flanged discs permit of all three pawls moving, but in any other position of the lever 75 only one of the pawls can move. Also when the lever 75 is moved from the central position, a cam slot 182 operates, through a roller 183 slotted pivoted arms 184, 189 and roller 187, an arm 185 to rock the shaft 186. A rod 188 carried by arms on this shaft extends across the tail parts of the lower levers 82 of the detent-plates 79 and prevents their movement thus locking the key-banks 71. The total lever 75 is locked in any adjusted position and if not correctly positioned the release of the machine is prevented. A roller 192 co-operates with the scalloped edge of a lever 193 secured to a sleeve 194 loose on a stud 195. An arm 196 on the sleeve 194 carries a pin 197 lying in a notch in an arm 198 loose on the shaft 199 and pulled down by a spring 200 attached to a two-armed lever 201. A turned-over part 202 of the arm 198 projects through the casing and lies below an arm 204 on the shaft 57. If the roller 192 is not in a scallop, the arm 198 is rocked sufficiently for the part 202 to obstruct the arm 204 and to prevent rocking of the shaft 57. After the release of the machine, the lower end of the arm 205 of the lever 201 will be carried out of a notch in a disc on the main shaft 65 and the other arm 208 is brought under a flattaned pin 209 on the lever 193 preventing movement of the lever and locking the handle 75. Specifications 8119/15, 100,568, 100,569, 100,570, 203,761, 203,995, and 206,798 are referred to.